REHAB Fontan Failure: A Trial of Cardiac Rehabilitation

This trial is testing whether cardiac rehabilitation (a structured exercise and education program) can benefit adults who have Fontan circulation failure — a serious complication that can occur in people who were born with a heart defect and had a surgical procedure called the Fontan operation. The study aims to see if cardiac rehab can improve heart function, quality of life, and exercise capacity in this population. **You may be eligible if...** - You are 18 years or older - You have had a Fontan operation (a surgery for congenital heart disease) and now have Fontan failure, defined as having at least one of: reduced heart pumping function (EF below 50%), protein-losing enteropathy, plastic bronchitis, chronic use of diuretics (prescribed by a specialist), or poor exercise capacity **You may NOT be eligible if...** - You depend on IV heart medications to maintain blood pressure (inotrope-dependent) - You have symptomatic arrhythmias that are not controlled - You are pregnant - You already participate in a cardiac rehab program or have a medical reason you cannot - You are planning a Fontan-related procedure within the next 3 months - Your baseline oxygen levels at rest are below 80% Talk to your doctor to see if this trial is right for you.